John de Lancie
John played the villainous Colonel Frank Simmons in five Stargate SG1 episodes but was better known for playing “Q” in TNG, DS9 and Voyager. He has also recently starred in Torchwood and also does a lot of voice work including the My Little Pony franchise. IMDBTwitterOfficial

Ingrid Kavelaars
Ingrid was Major Erin Grant in three episodes of stargate SG1 as well as roles on Jeremiah, ReGenesis, The Listener, Bent, Incorporated, Lost Girl, The Handler, XIII: The Series, Code Name: Eternity. IMDBTwitterLouis Cirillo
Louis played Bert Simmons in the Stargate SG1 episode Citizen Joe and is an accomplished voice actor as well as appearing on GRIMM, Watchmen, Dead Like Me, Andromeda and The 4400.IMDBTwitterGeorgia Craig
Georgia played Sabrina Gosling in the Stargate SG1 episode Moebius, Part 1 and also appeared on Battlestar Galactica, Good Luck Chuck and Supernatural. She was also a casting associate on Arctic Air and The Killing. IMDBNicholas Harrison
Nicholas played the Black Knight, Red Guard and a plain old Knight on Stargate SG1 as well as stunt work and spots on Supernatural, Dead Zone, Fools For Hire and Human Cargo. IMDBTwitterChristian Lattman
Christian played the “Shadowy Figure” in the Stargate Atlantis episode The Real World. He has also been on Severance, Ashes and Things To Do. IMDBTwitter